sdk-rt-thread-source-code/libcpu/aarch64/common/include/cpuport.h

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2023-10-25     Shell        Move ffs to cpuport, add general implementation
 *                             by inline assembly
 * 2024-01-18     Shell        support rt_hw_thread_self to improve overall performance
 */

#ifndef  CPUPORT_H__
#define  CPUPORT_H__

#include <armv8.h>
#include <rtcompiler.h>
#include <rttypes.h>

#ifdef RT_USING_SMP

/**
 * Spinlock
 */

typedef struct
{
    rt_uint32_t value;
} rt_hw_spinlock_t;

#endif /* RT_USING_SMP */

#define rt_hw_barrier(cmd, ...) \
    __asm__ volatile (RT_STRINGIFY(cmd) " "RT_STRINGIFY(__VA_ARGS__):::"memory")

#define rt_hw_isb() rt_hw_barrier(isb)
#define rt_hw_dmb() rt_hw_barrier(dmb, ish)
#define rt_hw_wmb() rt_hw_barrier(dmb, ishst)
#define rt_hw_rmb() rt_hw_barrier(dmb, ishld)
#define rt_hw_dsb() rt_hw_barrier(dsb, ish)

#define rt_hw_wfi() rt_hw_barrier(wfi)
#define rt_hw_wfe() rt_hw_barrier(wfe)
#define rt_hw_sev() rt_hw_barrier(sev)

#define rt_hw_cpu_relax() rt_hw_barrier(yield)

#define rt_hw_sysreg_write(sysreg, val) \
    __asm__ volatile ("msr "RT_STRINGIFY(sysreg)", %0"::"r"((rt_uint64_t)(val)))

#define rt_hw_sysreg_read(sysreg, val) \
    __asm__ volatile ("mrs %0, "RT_STRINGIFY(sysreg)"":"=r"((val)))

void _thread_start(void);

#ifdef ARCH_USING_HW_THREAD_SELF
rt_inline struct rt_thread *rt_hw_thread_self(void)
{
    struct rt_thread *thread;
    __asm__ volatile ("mrs %0, " RT_STRINGIFY(ARM64_THREAD_REG) :"=r"(thread));

    return thread;
}

rt_inline void rt_hw_thread_set_self(struct rt_thread *thread)
{
    __asm__ volatile ("msr " RT_STRINGIFY(ARM64_THREAD_REG) ", %0"::"r"(thread));
}

#endif /* ARCH_USING_HW_THREAD_SELF */

#endif  /*CPUPORT_H__*/